Process for the parallel transmission of binary digital signals

摘要

A process for the parallel transmission of binary digital signals over the channels of a frequency division multiplex is described. The band-width utilisation of the channels is doubled by combining in each case two bits of the information to be transmitted to form a new quaternary code element having four possible characteristic states. The quaternary code element is equalised and shaped on the receiving side by a Nyquist filter (N) and an all-pass filter (A). <IMAGE>